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    <title>sub-sup标签-上下标</title>
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<h1>sub-sup标签</h1>
<p>代码示例：Log&lt;sub&gt;2&lt;/sub&gt; 16 = 2&lt;sup&gt;2&lt;/sup&gt;</p>
Log<sub>2</sub> 16 = 2<sup>2</sup>
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